Isca query

Hi. Can some one please answer this question or state where in the institute mateial (page) the answer is. I searched but could not find it.

"ABC company receives orders from customers either by telephone, fax or through EDI . A clerk then transcribes the order into one of the company’s order form to be keyed into the order system. You being an ISA auditor recommend the various internal control procedures to be adopted to prevent inaccurate or unauthorized source data entry?"